<template>
  <div class="todo-footer" v-show="total">
    <label>
      <!-- <input type="checkbox" :checked="isAll" @change="checkAll"/> -->
      <input type="checkbox" v-model="isAll"/>
    </label>
    <span>
      <span>已完成{{doneTotal}}</span> / 全部{{total}}
    </span>
    <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
  </div>
</template>

<script>
  export default {
    name:'MyFooter',
    props:['todos','checkAllTodo','clearAllTodo'],
    computed:{
      total(){
        return this.todos.length
      },
      doneTotal(){
          /* const x = this.todos.reduce((pre,current)=>{
          console.log('@',pre,current)
          return pre + (current.done ? 1 : 0)
        },0) */
        return this.todos.reduce((pre,todo)=> pre + (todo.done ? 1 : 0),0)
      },
      isAll:{
        get(){
          return this.doneTotal === this.total && this.total > 0
        },
        set(value){
          this.checkAllTodo(value)
        }
      }
    },
    methods: {
      /* checkAll(e){
        this.checkAllTodo(e.target.checked)
      } */
      clearAll(){
        if(confirm('确定清除已完成任务吗?')){
          this.clearAllTodo()
        }
      }
    },
  }
</script>

<style scoped>
  /*footer*/
  .todo-footer {
    height: 40px;
    line-height: 40px;
    padding-left: 6px;
    margin-top: 5px;
  }

  .todo-footer label {
    display: inline-block;
    margin-right: 20px;
    cursor: pointer;
  }

  .todo-footer label input {
    position: relative;
    top: -1px;
    vertical-align: middle;
    margin-right: 5px;
  }

  .todo-footer button {
    float: right;
    margin-top: 5px;
  }

</style>